<template>
  <div>
    <h2>选择你喜欢的数字</h2>
    <label v-for="(item, index) in arr" :key="index"
      ><input type="checkbox" v-model="list" :value="item" />{{ item }}</label
    >
    <p>你选中的元素，累加的值的和为：{{ add }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      list: [],
    };
  },
  computed: {
    add() {
      return this.list.reduce((all, item) => (all = item + all), 0);
    },
  },
};
</script>

<style scoped></style>
